Thank you very much. I have been struggling from two days not knowing what to do. But, I need more of your support.
1) Do you think page speed script has been generated by a plugin or by hosting service to enhance the speed?
2) I have no idea on how to implement the solution given in the product forum
Here's what it says, which is totally unclear
I think I'd try to exclude adsbygoogle.js from optimizations with "no defer" attribute:
<script pagespeed_no_defer="" async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
And on https://code.google.com/apis/console/?#:pagespeedservice console, "Page Speed Service" / "Configure Rewriters" tab / "List of URLs served without any optimizations (blacklist)", add AdSense to the list:
http://pagead2.googlesyndication.com/*
Please help me sort this issue by step by step procedure. Thank you for identifying my problem.